251242441 has 4 divisors (see below), whose sum is σ = 253681792. Its totient is φ = 248803092.

The previous prime is 251242427. The next prime is 251242447. The reversal of 251242441 is 144242152.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 251242441 - 2¹¹ = 251240393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251242447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1219521 + ... + 1219726.

It is an arithmetic number, because the mean of its divisors is an integer number (63420448).

Almost surely, 2^251242441 is an apocalyptic number.

It is an amenable number.

251242441 is a deficient number, since it is larger than the sum of its proper divisors (2439351).

251242441 is a wasteful number, since it uses less digits than its factorization.

251242441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2439350.

The product of its digits is 2560, while the sum is 25.

The square root of 251242441 is about 15850.6290411453. The cubic root of 251242441 is about 631.0023859605.

Adding to 251242441 its reverse (144242152), we get a palindrome (395484593).

The spelling of 251242441 in words is "two hundred fifty-one million, two hundred forty-two thousand, four hundred forty-one".